DE102021200809A1 - A rotor lamination, a rotor core, a rotor and a method for manufacturing a rotor - Google Patents

Abstract

In order to improve a rotor lamination, which has a cutout that forms at least one interior space, each interior space having at least two interior regions, with at least one first pressing surface or one positioning surface being provided, a laminated rotor core, a rotor or a method for producing a rotor, Because the interiors of the rotor laminations have multifunctional shapes that offer various advantages during later assembly to form the rotor lamination stack or rotor, it is proposed that the rotor laminations form at least one first positioning lug between the first interior area and the second interior area, with the first positioning lug forming at least the positioning surface and/or has the first contact surface.

Description

The invention relates to a rotor lamella, a laminated rotor core and a rotor. Furthermore, the invention relates to a method for producing a rotor.

Ever since the discovery of high-energy permanent magnets (e.g. neodymium-iron-boron and samarium-cobalt magnets), permanent magnet synchronous machines (PMSM) have been used in an increasingly diverse range of applications, e.g. as drives for motor vehicles, as machine tools in the industrial sector, in energy-efficient household appliances or as drives for pumps. Due to the improved energy densities of the magnets, these machines have high torque densities and high efficiencies.

The magnets can be attached to the surface of the rotor facing the air gap. Then one speaks of so-called surface magnets. Or the magnets are integrated within the pockets provided in the rotor. Then there is talk of buried magnets.

Basically, it should be noted that due to the rotation, a centrifugal force acts on the magnets, which accelerates the magnets outwards, which means that a corresponding fixation or rotor lamella design is required. In the case of a rotor with buried magnets, the sheet metal section of the rotor laminations must be designed in such a way that the electrical steel sheet does not burst over the entire service life of the electric motor.

Additional stress hits the magnets when the motors are subjected to an active short circuit.

An active short circuit (ACS) is a measure in drive technology to avoid damage that can occur as a result of various faults in the vehicle. A purposefully induced AKS is considered a safe operating mode for prime movers. For this purpose, the connection lines of the motors, which are usually operated with three-phase current, are short-circuited by e.g. IGB transistors of the power electronics.

The AKS is considered a safe condition in vehicles with an electrified drive concept. A major advantage is that the system is stress-free in operating situations such as maintenance or a crash. This is particularly advantageous for synchronous machines excited by permanent magnets, as these can induce life-threatening voltages at high speeds.

From the DE 10 2015 203 018 A1 a rotor is known which has a plurality of rotor stacks stacked one on top of the other in the longitudinal direction of extent of the rotor. On an outer circumference, the rotor stacks have a plurality of channels spaced apart from one another in the circumferential direction of the rotor, in each of which at least one magnet is arranged. One pair of magnets is arranged in a V-shape in a circular sector in a sectional plane of the rotor stack along the shaft. The electrical machine is characterized in particular by the fact that the channels each extend over the entire length of the rotor and are each formed continuously in the direction of longitudinal extension, the channels being completely filled with an injectable plastic, so that the magnets penetrate through the plastic in the channels are fixed. As a result, a powerful electric machine that is easy to produce can be provided.

From the U.S. 2015 0236558 A1 and the US20160028278A1 rotors are known which have a plurality of rotor stacks stacked one on top of the other in the longitudinal direction of extension of the rotors. On an outer circumference, the rotor stacks have a plurality of channels spaced apart from one another in the circumferential direction of the rotor, in each of which at least one magnet is arranged. The magnets are each arranged along a chord.

The object of the present invention is to improve a rotor lamina in such a way that the interior spaces of the rotor lamina have multifunctional shapes that offer various advantages during later assembly into the rotor laminated core or rotor, e.g. that they contain so-called AKS lugs that stabilize the built-in magnets that the positioning of the magnet is more precise, and that the arrangement of plastic guide surfaces enables injection of an injectable plastic in one work step. Furthermore, it is an object of the invention to improve the laminated rotor cores so that they can form a particularly stable rotor, e.g. B. characterized in that the individual rotor laminations and / or rotor stacks are firmly connected to each other, which is also intended to improve the method for manufacturing a rotor. The present invention is a rotor of an electric machine with buried magnets.

To solve this problem, a rotor lamination according to claim 1, a rotor lamination stack according to claim 8, a rotor according to claim 9 and a method for manufacturing the rotor according to claim 10 are proposed.

According to the invention, the rotor blade has at least one section which is at least forms an interior space, each interior space having at least two interior areas, at least one first contact surface or one positioning surface being provided, at least one first positioning lug being formed between the first interior area and the second interior area, the first positioning lug having at least the positioning surface and/or the has contact surface.

The rotor lamina preferably consists of an electrical steel sheet that can be punched or is suitable for laser cutting. The cutout of the rotor laminations is the part of the sheet metal that is removed from the electrical steel sheet by punching or laser cutting. This creates an opening in the electrical sheet, which forms an interior space in the plane of the sheet. The rotor lamina preferably has any number of cutouts or interior spaces.

According to the invention, the interior has at least one first positioning lug. This positioning nose is formed inwards, which is to be understood by inside that the central axis of the nose lies in the plane of the electrical steel sheet in which the interior space is divided by z. B. the laser cut has arisen. According to the invention, the positioning lug is arranged between the first inner area and the second inner area of the interior space and has the positioning surface and/or the pressing surface. The pressing surface is designed in such a way that a magnet that can be arranged in the first inner area can lie flush against the surface without creating a gap.

The rotor lamina preferably has at least one first plastic guide lug formed between the first inner area and the second inner area, the plastic guide lug being arranged on an opposite side of the first positioning lug, the first plastic guide lug having a first plastic guide surface with or without a plastic guide bulge. The plastic guide surface is preferably designed in such a way that it does not lie flush against a magnet that can be arranged in the first inner region, but is designed at a distance from the arranged magnet, so that an injectable plastic can flow on the plastic guide surface with less resistance than on the opposite positioning lug. Adjacent to the plastic conducting surface, a plastic conducting bulge is preferably also optionally formed, just as a plastic conducting bulge can always optionally be formed adjacent to a plastic conducting bulge in order to further improve the flow of the injectable plastic. Due to the spatial proximity of the positioning lug and the plastic guide lug, which are formed in the sheet metal, these two preferably form so-called "AKS lugs". Due to the arrangement of the magnets and the design of the lugs, which stabilize the magnets, the magnetic fields H [A/m] in the magnet, which in the AKS case act against the direction of magnetization of the magnets - and can thus permanently weaken the magnets -, reduced.

The rotor lamina according to the invention advantageously has at least one third inner area which adjoins the first inner area, with at least one positioning tab being arranged in the third inner area. This positioning tab is preferably designed in such a way that, in a starting position without an inserted magnet, its central axis protrudes in the plane of the electrical lamination into the first inner area and it springs a magnet, which is arranged in the first inner area, onto the first contact surface arranged on an opposite side of the positioning tab presses. For this purpose, the positioning tab is designed to be resilient and can be bent in such a way that the magnet is held in position by this bending surface.

The rotor lamina preferably has a first AKS nose, which is arranged between the first and the third inner region, the first AKS nose being designed to project inwards. The first AKS nose is preferably formed at a distance from the magnet that can be arranged. Advantageously, a plastic guiding bulge is formed on an opposite side of the first AKS nose between the first and the third interior area. This points outwards, that is, here the sheet metal section is enlarged and the central axis of the plastic guide bulge points away from the interior. This plastic guide bulge is preferably designed so that an injectable plastic can flow along the magnet with the least possible resistance when the magnet is in place than with the opposite first AKS nose; a plastic guide surface is preferably also formed adjacent to the plastic guide bulge.

At least one magnet can advantageously be arranged in the rotor lamina, with the magnet resting flush with its contact surface on at least the first contact surface and/or on the positioning surface, without creating a gap, with the magnet being held by the positioning tab on a surface opposite the first contact surface Page is formed, is resiliently pressed. In the case of a cuboid magnet, the contact surface and the positioning surface are preferably adjacent and are at a 90° angle to one another, so that the magnet can lie flush. When the magnet is arranged, an intermediate area is preferably formed within the first inner area, which is on a counter Overlying side to the first contact surface or the first positioning surface is located and arises between the magnet and an interior wall. This intermediate area serves as a channel for the injectable plastic that can flow between the magnet and the interior wall.

Depending on requirements, a number of interior spaces can be formed in different shapes in the rotor lamina and can be variably arranged in relation to one another. In a preferred embodiment, at least two interior spaces are designed in such a way that they are arranged at a distance from one another in a V-shape, with the apex of the V being directed radially inwards towards the shaft and/or at least one further cut-out being arranged between the legs of the V, the interior spaces lying on the legs of the V preferably being oriented such that the second interior region lies radially outward and the positioning surface lies on the inside of the leg of the V. The angle between the legs of the V can preferably be between 0° and 180°, the angle being chosen such that the interior spaces do not overlap. The central axis of the V is advantageously a mirror axis at the same time. In the case of the interior, which lies between the two legs of the V, the first contact surface is advantageously arranged radially on the outside and the third inner area is arranged radially on the inside.

The first interior space between the legs of the V preferably has a mirror plane which is at a 90° angle to the sheet metal plane and which runs along the center axis of the positioning tab and intersects the center of the first contact surface.

Preferably, a laminated rotor core consists of at least two rotor laminations, which are arranged in such a way that at least two interior spaces form at least one pocket for receiving a magnet, with at least one rotor lamina having a positioning tab, through which an insertable magnet can be pressed against the first contact surface, in particular resiliently, wherein the axial length of the laminated rotor core is determined by the axial length of the magnet and the length of all rotor laminations is selected such that the pocket also completely accommodates at least one magnet in the axial direction. A rotor lamina preferably has an axial length of between 0.1 and 1 mm and a magnet preferably has an axial length of > 1 mm. As a result, a large number of rotor laminations are required in the axial length to accommodate a magnet in such a way that the magnet is completely absorbed and if possible no gaps form in the axial direction between the magnets of the rotor lamination stacks and the rotor laminations. With an assumed axial length extension of a rotor lamina of 0.1 mm and a magnet thickness of 1 cm, at least 100 rotor laminations would be necessary to completely accommodate the magnet in the axial direction. So many rotor lamellas with positioning tabs are preferably selected for each rotor laminated core that the force is exerted evenly on the magnet(s) in order to press it/them fully resiliently against the first contact surface and hold it in this position. A defined number of positioning tabs is to be designed so that a uniform and sufficient spring force is ensured on each magnet.

A rotor preferably consists of at least one laminated rotor core. In the case of two or more laminated rotor cores arranged one behind the other, after at least each laminated rotor core, the following laminated rotor core is arranged rotated further by an angle on the shaft. The angle by which it is rotated about the longitudinal axis of the shaft is preferably between 0° and 30°. If the angle is 0°, the pockets of the laminated rotor cores merge directly into one another. If all rotor stacks are to be molded when assembled and the angle is preferably greater than 0°, it may be chosen such that the interior spaces of the pockets still partially overlap. For example, the pockets of a laminated rotor core must still be connected to the pockets of the adjacent laminated rotor core to such an extent that a sprayable plastic can flow through all the laminated rotor cores. The angle can preferably be kept constant, so that a uniform distribution results when a large number of laminated rotor cores are arranged in series, or the angle can be selected differently for each laminated rotor core. Due to the overlap, all pockets arranged one above the other or one behind the other are preferably connected, so that an injectable plastic can flow via at least one first injection point and/or at least one second injection point into all free spaces of the interior areas that are not filled by the magnet. The position of the first injection point(s) and of the second injection point(s) is/are preferably determined by a person skilled in the art; further injection points are particularly preferably located within the inner regions.

1. a) Anordnung von mindestens zwei Rotorlamellen zu mindestens einem Rotorlamellenpaket,
2. b) Anordnung von mindestens einem Magneten in mindestens einem Rotorlamellenpaket,
3. c) Anordnung von mindestens einem Rotorlamellenpaketen zu mindestens einem Rotor, besonders bevorzugterweise erfolgt der Zusammenbau auf einer Welle,
4. d) Anspritzung mit einem spritzfähigem Kunststoff über mindestens einen ersten Anspritzpunkt, wobei der Kunststoff entlang mindestens einer Kunststoffleitfläche in einer ersten Fließrichtung in den Zwischenbereich fließt und/oder mindestens einen zweiten Anspritzpunkt, wobei der Kunststoff entlang der Kunststoffleitausbuchtung in einer zweiten Fließrichtung in den Zwischenbereich fließt, wobei der Magnet an der dem Zwischenbereich gegenüberliegenden Anpressfläche und/oder Positionierfläche in Anpressrichtung anliegt, und
5. e) Aushärtung des Kunststoffs, wodurch der jeweilige Magnet in der jeweiligen Tasche fixiert wird.

A method is preferably proposed for assembling a rotor from the rotor laminations, in which at least the following steps are used:

1. a) Arrangement of at least two rotor laminations to form at least one rotor lamina pack,
2. b) Arrangement of at least one magnet in at least one rotor laminations,
3. c) Arrangement of at least one rotor disk pack to form at least one rotor, particularly preferably the assembly takes place on a shaft,
4. d) Injection with an injectable plastic via at least one first injection point, with the plastic flowing along at least one plastic guiding surface in a first flow direction into the intermediate region and/or at least one second injection point, with the plastic flowing along the plastic guiding bulge in a second flow direction into the intermediate region , wherein the magnet rests against the pressing surface and/or positioning surface opposite the intermediate region in the pressing direction, and
5. e) Hardening of the plastic, as a result of which the respective magnet is fixed in the respective pocket.

The molding process, via which the injectable plastic is injected, can preferably be carried out both in the individual laminated rotor core and in the assembly of all rotor cores—in particular also with a bevel. As a result, a rotor can preferably also be assembled from different laminated rotor cores with different embodiments of the pockets. In addition, the injectable plastic compound improves the mechanical strength / dimensional stability of the laminated rotor core. In addition, the thermal connection of the magnets to the laminated core is improved. This increases the efficiency of electric motors with such a rotor.

The pockets (with lugs and bulges) are preferably formed in such a way that they allow the injectable plastic to flow in a directed manner. This achieves the targeted final alignment of the magnets. The construction of the pockets thus preferably allows the injectable plastic to be injected or cast from the interior spaces to the magnet.

The rotor is preferably designed as part of an electric motor for a motor vehicle, in particular an electric motor vehicle. A so-called air gap is formed between the rotor and the stator.

The invention is explained below by way of example using preferred embodiments.

• 1: einen Teil einer Rotorlamelle ohne Magneten mit Positionierlasche in einer Draufsicht.
• 2: einen Teil einer Rotorlamelle mit angeordnetem Magneten in einer Draufsicht.
• 3: einen Teil von mehreren Rotorblechpaketen im geschrägten Zusammenbau in einer perspektivischen Ansicht.
• 4: die Anordnung der Magnete in einem Rotor bei geschrägtem Zusammenbau in einer perspektivischen Ansicht, wobei das Blech nicht gezeigt ist.

They show schematically:

• 1 : part of a rotor lamella without magnets with a positioning tab in a plan view.
• 2 : a part of a rotor lamella with an arranged magnet in a plan view.
• 3 : a perspective view of a part of several rotor lamination stacks assembled at an angle.
• 4 1: the arrangement of the magnets in a rotor when assembled at an angle in a perspective view, the sheet metal not being shown.

Exemplary embodiments of the invention are explained in more detail below with reference to the drawings.

1 Figure 13 shows a top view of a portion of a rotor blade 100 having three interior spaces 10, 10a, 10b, two interior spaces 10a, 10b being spaced apart in a V-shape and one interior space 10 lying between the legs of the V. The inner spaces 10, 10a, 10b each have a first inner area 13, 13a, 13b, a second inner area 14, 14a, 14b and a third inner area 15, 15a, 15b.

The interior space 10 between the legs 35, 35a of the V has a first positioning lug 11 between the first interior region 13 and the second interior region 14, which is directed into the interior space 10. This positioning lug 11 has a positioning surface 16 which borders on the first inner area 13 and is adjacent to a first contact surface 12 . The positioning surface 16 and the first pressing surface 12 are at a 90° angle to one another. On an opposite side 33 to the positioning lug 11 , an inwardly directed first plastic guide lug 20 is formed between the first inner area 13 and the second inner area 14 . The third interior region 15 is formed adjacent to the center of the first interior region 13 . This third interior area 15 has a positioning tab 18 which protrudes into the first interior space 13 . Starting from an in 4 On the shaft 31 shown, a mirror axis 32 runs through the radially inward-pointing tip 34 of the V and runs centrally through the positioning tab 18, the first inner area 13 and the contact surface 12, so that the second inner area 14 is mirrored with all the features on the opposite side.

The interior space 10a in the leg 35 of the V has a first interior region 13a which borders a second interior region 14a. The second inner area 14a points radially outwards. A third inner area 15a also adjoins the first inner area 13a on the opposite side 33a of the second inner area 14a, the third inner area 15a pointing radially inwards. Between the first inner region 13a and the In the second inner area 14a, a first positioning lug 11a directed into the inner space 10a is formed. This positioning nose 11a has a contact surface 12a, which borders on the first inner region 13a and is adjacent to a first positioning surface 16a. The positioning surface 16a and the first pressing surface 12a are at a 90° angle to one another. On a side opposite to the positioning nose 11a, an inwardly directed first plastic guide nose 20a is formed between the first inner region 13a and the second inner region 14a. The third inner area 15a has a positioning tab 18a which protrudes into the first inner space 13a. A first AKS nose 17a directed into the interior 10a is formed between the first interior region 13a and the third interior region 15a. On an opposite side 33a to the first AKS nose 17a, an outwardly directed plastic guide bulge 22a is formed between the first inner area 13a and the third inner area 15a. The interior 10b of the second leg 35a of the V, which is mirrored via the mirror axis 32, has the mirrored features of the interior 10a; the reference symbols are provided with a “b”. An air gap 38 is formed radially outside of the rotor blade 100 .

The rotor lamella 100 can also be designed in such a way that no positioning tab 18, 18a, 18b is formed in the third inner area 15, 15a, 15b and the inner area 15, 15a, 15b is correspondingly larger (not shown).

2 shows the top view of the rotor lamella 100, in which a magnet 19, 19a, 19b is arranged in the first inner region 13, 13a, 13b. The magnet 19, 19a, 19b is spring-loaded in the direction 27, 27a, 27b to the pressing surface 12, 12a, 12b on the opposite side by the positioning tab 18, 18a, 18b pivoted laterally out of the plane of the sheet metal of the rotor lamella 100 in this position pressed and held in position. As a result of this positioning, an intermediate region 21, 21a, 21b is formed between the magnet and one side 33, 33a, 33b of the interior 10, 10a, 10b in the first interior region 13, 13a, 13b. The plastic guide lug 20, 20a, 20b is formed at a distance from the magnet and has a plastic guide surface 29, 29a, 29b, which is connected to the side 33, 33a, 33b of the intermediate area 21, 21a, 21b. The plastic guide surface 29, 29a, 29b is designed in such a way that an injectable plastic 36, which is injected via a first injection point 23, 23a, 23b, flows along the plastic guide surface 29, 29a, 29b in a first flow direction 25, 25a, 25b in the Intermediate region 21, 21a, 21b can flow.

In the interior space 10 between the legs 35, 35a of the V, the magnet 19 rests against the two first positioning surfaces 16, and the intermediate space 21 is formed between the magnet 19 and the opposite side 33 of the first contact surface 12. The injectable plastic 36 fixes the magnet 19 in direction 28 on the contact surface 12.

In the inner spaces 10a, 10b in the legs 35, 35a of the V there is also a second injection point 24a, 24b in the third inner area 15a, 15b, with the injectable plastic 36 flowing from the second injection point 24a, 24b in a second flow direction 26a, 26b the plastic guide bulge 22a, 22b can flow into the intermediate area 21. The injectable plastic 36 fixes the magnet 19a, 19b in the direction 28a, 28b on the positioning surface 16a, 16b.

3 shows a perspective view of a plurality of rotor lamellae 100 which are assembled to form a laminated rotor core 40 . In the laminated rotor core 40, a plurality of inner spaces 10, 10a and 10b, which each merge into one another, form a pocket 30, 30a, 30b. A magnet 19, 19a, 19b is arranged in a pocket 30, 30a, 30b in each rotor laminated core 40 and is held in position by a number of positioning tabs 18, 18a, 18b (see FIG 4 ). The number of rotor laminations 100 with positioning lugs 18, 18a, 18b is chosen such that positioning lug 18, 18a, 18b pressed out of the plane of the rotor lamination by the springing does not overlap with the following positioning lug 18, 18a, 18b. Rotor laminations 100 without positioning lugs 18, 18a, 18b are arranged between rotor laminations 100 with positioning lugs 18, 18b, 18c. The axial length AL of the magnet (see 4 ) is chosen so that in the axial length extension AE (see 5 ) of a pocket 30, 30a, 30b of a laminated rotor core 40, as far as possible no free space is created between individual rotor lamination laminations 100. Even with a further laminated rotor core 40, which is arranged in the longitudinal direction of the shaft 31 behind or in front of the first laminated rotor core 40, the outer rotor laminations 100 and the magnets 19, 19a, 19b lie as directly as possible on one another.

At least one laminated rotor core 40 is assembled to form a rotor 50 in such a way that the next laminated core 40 in the longitudinal direction of the shaft 31 is rotated at an angle around the shaft 31 (see FIG 4 ). This angle is selected in such a way that the second inner areas 14, 14a, 14b and the third inner areas 15, 15a, 15b of the pockets 30, 30a, 30b of the laminated rotor cores 40 at least partially overlap.

4 shows the schematic representation of the arrangement of the magnets 19, 19a, 19b in the pockets 30, 30a, 30b of a rotor 50 (not shown here, see 5 ), in which several rotor laminationspa kete 40 (not shown here, see 5 ) are assembled one behind the other in the longitudinal direction of the shaft 31. Two rotor cores 40 are arranged in such a way that the pockets 30, 30a, 30b of the rotor cores 40 merge completely into one another. The following rotor laminated core 40 is rotated at an angle around the shaft 31 of the rotor 50, so that the inner areas of the pockets 30, 30a, 30b at least partially overlap.

5 shows a rotor 50 in which four laminated rotor cores 40, each consisting of a plurality of rotor laminations 100, are assembled here by way of example. Due to the molding process, the injectable plastic 36 is distributed in the pockets 30, 30a, 30b in such a way that they are completely filled and the magnets 19 are fixed in their positions.

Reference List

10, 10a, 10b

inner space

11, 11a, 11b

first positioning lug

12, 12a, 12b

first contact surface

13, 13a, 13b

first interior

14, 14a, 14b

second interior

15, 15a, 15b

third interior

16, 16a, 16b

positioning surface

17a, 17b

first AKS nose

18, 18a, 18b

positioning tab

19, 19a, 19b

magnet

20, 20a, 20b

first plastic guide nose

21, 21a, 21b

intermediate area

22a, 22b

plastic guide bulge

23, 23a, 23b

first injection point

24a, 24b

second injection point

25, 25a, 25b

first flow direction

26a, 26b

second flow direction

27, 27a, 27b

Alignment direction by positioning tab

28, 28a, 28b

Alignment direction through molding compound

29a, 29b

first plastic conductive surface

30, 30a, 30b

pocket

31

Wave

32

mirror axis

33, 33a, 33b

opposite side

34

top of the V shape

35, 35a

thigh of the V

36

injectable plastic

37, 37a. 37b

cutout

38

air gap

40

rotor core

50

rotor

100

rotor blade

AL

axial length of the magnet

AE

axial length extension

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102015203018 A1 [0008]
• US20150236558A1 [0009]
• US 20160028278 A1 [0009]

Claims (10)

Rotor lamella (100), which has at least one cutout (37, 37a, 37b) which forms at least one interior space (10, 10a, 10b), each interior space (10, 10a, 10b) having at least two interior regions (13, 13a, 13b , 14, 14a, 14b), wherein at least one first contact surface (12, 12a, 12b) or one positioning surface (16, 16a, 16b) is provided, characterized in that at least one first positioning lug (11, 11a, 11b) between the first inner area (13, 13a, 13b) and the second inner area (14, 14a, 14b), the first positioning lug (11, 11a, 11b) having at least the positioning surface (16) and/or the first pressing surface (12, 12a , 12b). Rotor blade (100) after claim 1 , characterized in that at least one first plastic deflector (20, 20a, 20b) is formed between the first inner area (13, 13a, 13b) and the second inner area (14, 14a, 14b), the first plastic deflector (20, 20a, 20b) on an opposite side (33, 33a, 33b) of the first positioning lug (11, 11a, 11b), the first plastic guide lug (20, 20a, 20b) having a first plastic guide surface (29, 29a, 29b). Rotor blade (100) after claim 1 or 2 , characterized in that a third inner area (15, 15a, 15b) adjoins the first inner area (13, 13a, 13b), a positioning tab (18, 18a, 18b) being formed in the third inner area (15, 15a, 15b). . Rotor blade (100) after claim 3 , characterized in that between the first inner area (13a, 13b) and the third inner area (15a, 15b) a first AKS nose (17a, 17b) is formed. Rotor blade (100) after claim 4 , characterized in that between the third inner area (15a, 15b) and the first inner area (13a, 13b) on an opposite side (33a, 33b) of the first AKS nose (17a, 17b) there is a plastic guide bulge (22a, 22b ) is trained. Rotor lamination (100) according to one of the preceding claims, characterized in that a magnet (19, 19a, 19b) can be arranged in the first inner area (13, 13a, 13b) and when the magnet (19, 19a, 19b) is arranged, an intermediate area (21 , 21a, 21b) within the first inner area (13, 13a, 13b), wherein the magnet (19, 19a, 19b) has its contact surface on at least the first contact surface (12, 12a, 12b) and/or the positioning surface ( 16) is present. A rotor blade (100) as claimed in any preceding claim, characterized in that the rotor blade (100) has at least two interior spaces (10a, 10b) spaced apart in a V-shape with the apex (34) of the V pointing radially downwards is directed inwards towards the shaft (31) and at least one further interior space (10) is arranged between the legs (35, 35a) of the V. Rotor laminated core (40), characterized in that the rotor laminated core (40) consists of at least two rotor laminations (100) according to one of the preceding Claims 1 - 7 which are arranged in such a way that at least two interior spaces (10, 10a, 10b) form at least one pocket (30, 30a, 30b), with at least one rotor blade (100) having a positioning tab (18, 18a, 18b) through which in particular at least one magnet (19, 19a, 19b) that can be used in a resilient manner can be pressed against the first contact surface (12, 12a, 12b), the axial length extension (AE) of the laminated rotor core being limited by the axial length (AL) of the magnet(s) (19 , 19a, 19b) is determined and the axial length extension (AE) of all rotor laminations (100) is selected such that the pocket (30, 30a, 30b) completely accommodates the magnet(s) (19, 19a, 19b). Rotor (50) from at least one rotor laminated core (40) according to claim 8 , characterized in that after at least each rotor laminated core (40) the following rotor laminated core (40) is arranged rotated by an angle about the shaft (31) which is selected such that the pockets (30, 30a, 30b) of two rotor laminated cores ( 40), preferably at least partially, overlap. Method for manufacturing a rotor (50) according to claim 9 with the following steps: a) arranging at least two rotor laminations (100) to form at least one rotor laminations (40), b) arranging at least one magnet (19, 19a, 19b) in at least one rotor laminations (40), c) arranging at least a rotor laminations (40) to form at least one rotor (50), d) overmoulding with an injectable plastic (36) via at least one first injection point (23, 23a, 23b), the plastic (36) flowing along at least one plastic guide surface (29, 29a , 29b) in a first flow direction (25, 25a, 25b) into the intermediate region (21, 21a, 21b) and/or via at least one second injection point (24a, 24b), the plastic (36) flowing along the plastic guide bulge ( 22a, 22b) in a second flow direction (26a, 26b) into the intermediate area (21a, 21b), with the magnet (19, 19a, 19b) on the contact surface (12, 12a , 12b) and/o the positioning surface (16, 16a, 16b) in the pressing direction (28, 28a, 28b), and e) hardening of the plastic (36), whereby the respective magnet (19, 19a, 19b) in the respective pocket (30, 30a, 30b) is fixed.

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